EXPÉDITION ANTARCTIQUE BELGE 



Fig. 2(7. Cellarinella foveolata sp. nov. Younger part, x 25. From N° 683. 

 ib. do do Older part. X 25. From N° 683. 



2c. do do Mandible. X 85. 



zd. do do Xatural size. From N° 6og. 



2e. do do Natural size, nodulated form. From X' 743. 



2/. do do Calcareous section showing the underside of the distal 



rosette plate. X 25. From N° 683. 

 2g. do do Section showing the rosette plate from above, protected 



by a pair of spinous processes. X 85. 

 2h. do do The spinous processes seen in longitudinal section. 



X 25 and 85. 

 3(7. Turritigcra stellata Busk. X 3. From N° 611. 



3b. do do (b) Operculum. < 83. (c) Mandible. X 85. (c) do. X 25o. 



3d. do do Avicularium from the surface of the zoœcium. X 85. 



3e. do do Anterior surface. X 25. 



4(7. Orthopora compacta sp. nov. X 12. From X°343. (b) Operculum. X 85. (c) Mandible 



from small avicularium on the zoœcium. X 85. (d) Rostral 

 mandible. X 85. (c) Mandible of vicarious avicularium. 

 X85. 

 Xatural size. 



Section through a zoœcium showing tentacles, ovaria and 

 ova, and the wall of the compensating chamber. X 85. 

 From X° 342. 

 Ovarium. X 25o. 



Wall of the tentacular sheath. X 7^>°- 

 Cellcpora ? solida Busk. Operculum, from the British Muséum préparation. Chal- 

 lenger Station X" 160. X 85. 



PLATE VI 



Refepora antarctica sp. nov. x 2 5. From X° 608. 



do Dorsal surface. X 6. with broken surface (bk), showing 



the divisions of the zoœcia. 

 do Showing large raised avicularium. From X"° 620. 



do Tentacles showing dark mass in tip. x5oo. From X" 608. 



do Mandible. X 85. 



do Operculum. X 85. 



do Avicularium. X 85. 



do Calcareous section showing the internai (a a) « condyles » 



(teeth) near the base of the operculum, also the latéral 



rosette plate with « watch-glass » cover. X 85. 

 do Avicularian chamber, with branches leading to the 



proximal end of the zoœcium. 

 do Zoœcium showing the oral glands (gl) ; and also the 



latéral muscles. 



